After destroying the missile command post at Gluon 5 you have to jump onto the ruined launcher vehicle. Go to the lift shaft on your right and use the zero mass facilitator device (you got that in level 15 right?) to restart the Kobayashi boson fluctuator. Without the fluctuator on the defence field around K4 Mech Station will be too great. Follow the shaft for a while eliminating any psy-humes on the way with your mindpak (set it to ‘brainmelt’ – no time for subtlety). After a few obvious sections you’ll come to the end of the level where you must enter the K4 Mech Station and power down NeuroNet. Crawl under the I-beam and keep hitting the rear lock mechanism with everything you’ve got, avoiding incoming neural waves from the remote mind devices. After a while the lock will open – transmat immediately to the level above the lock and release the B-series nanoswarm into NeuroNet. At least that’s what my nephew told me.